package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DeleteOperation implements IOPeration {
    public void work(BookList bookList) {
        System.out.println("删除图书!");
        System.out.print("请输入你要删除的图书的书名: ");
        Scanner scanner=new Scanner(System.in);
        String name=scanner.nextLine();
        int pos=-1;
        int currentSize= bookList.getUsedSize();
        int i=0;
        for (i =0 ; i < currentSize - 1; i++) {
            Book book=bookList.getBook(i);
            if(book.getName().equals(name)) {
                pos=i;
                break;
            }

        }
        if(pos==-1) {
            System.out.println("没有找到你要删除的图书");
            return;
        }
        int j=pos;
        //开始删除
        for(;j<currentSize-1;j++) {
            Book book=bookList.getBook(j+1);
            bookList.setBooks(j,book);
        }
        bookList.setBooks(j,null);

        bookList.setUsedSize(currentSize-1);
    }
}